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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.6 mag was detected near `Ohonua in Tonga


Earthquake location -23.5397S, -175.5404WA light earthquake magnitude 4.6 (ml/mb) strikes 251 km SSW of `Ohonua, Tonga (156 miles) on Wednesday. Global time and date of event 21/07/16 / 2016-07-21 08:21:14 / July 21, 2016 @ 8:21 am UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was reported at 20:21:14 / 8:21 pm (local time epicenter). Exact location of earthquake, longitude -175.5404 West, latitude -23.5397 South, depth = 10 km. The epicenter was at a depth of 10 km (6 miles). Event id: us20006hsk. Ids that are associated to the earthquake: us20006hsk.

In the past 24 hours, there have been nine, in the last 10 days nine, in the past 30 days ten and in the last 365 days twenty-three earthquakes of magnitude 3.0 or greater that has occurred nearby. There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Questions or comments?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 251 km SSW of `Ohonua, Tonga. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude -175.5404° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -23.5397° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 251km SSW of `Ohonua, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2016-07-21 08:21:14 Time when the event occurred. UTC/GMT
Updated 2016-08-13 12:15:38 Time when the event was most recently updated. UTC/GMT
Timezone offset -720 Timezone offset from UTC in minutes at the event epicenter.
Felt 0 The total number of felt reports
CDI 1 The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status reviewed Indicates whether the event has been reviewed by a human.
Tsunami 0 This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG 326 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network us The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us, A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 6.862 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.81 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 94 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us20006hsk Id of event.
Event Code 20006hsk An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20006hsk, A comma-separated list of event ids that are associated to an event.

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